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Cable Insulation Coatings Via Electrophoresis

Publishing Venue

IBM

Related People

Washo, BD: AUTHOR

Abstract

Wires may be coated with substantial thickness insulation by electrophoretic deposition of dielectric material, from aqueous codispersion formulations of blended hard and soft polymer latices. Such deposits generally require removal of the soft component by drying and sintering or firing treatments, in order to obtain desired electrical characteristics. However, it has been found that the soft polymer constituent in such systems may degrade to a particulate resin, before the hard polymer melts and fuses, thereby leaving voids and "pockets" resulting in nonhomogeneous coatings of poor insulation quality.

Country

United States

Language

English (United States)

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Cable Insulation Coatings Via Electrophoresis

Wires may be coated with substantial thickness insulation by electrophoretic
deposition of dielectric material, from aqueous codispersion formulations of
blended hard and soft polymer latices. Such deposits generally require removal
of the soft component by drying and sintering or firing treatments, in order to
obtain desired electrical characteristics. However, it has been found that the soft
polymer constituent in such systems may degrade to a particulate resin, before
the hard polymer melts and fuses, thereby leaving voids and "pockets" resulting
in nonhomogeneous coatings of poor insulation quality.

This problem can be eliminated by adding to the initial codispersion
formulation, one or more latices of polymer material(s) subject to melting and
fusion at temperature(s) above the film forming temperature of the soft polymer
component and below the melting or softening point of the hard polymer
constituent. Such intermediate polymer component(s), which should be within
the same generic family for best effectiveness and compatibility, fills the voids left
by the pyrolyzed soft component and supplies properties of a binder for the
coating matrix. Therefore, for a given coating, a less soft component would be
required in the initial formulation. A programmed drying and sintering thermal
cycle is required in order to initiate film-forming of each respective material
component. An exemplary formulation of a fluorocarbon...